200（x+2）=150x x2
    （x-24/10.8）-（x/12）＝1
    x-24/10.8-x/12＝1
    （x-15)(-2x+90)=400
    （x-15)(-0.5x+45)=400
    (0.08-x/2.64-33*x)*36.2*ln(0.08-2.64-33*x)/x=14
    (0.08-x/2.64-33*x)*36.2*ln[(0.08-2.64-33*x)/x]=14
    (0.08-x/2.64-33*x)*36.2*ln((0.08-2.64-33*x)/x)=14
    2x+5（30-x）=90
    x÷x+2
    80％(80％x-20)+20+68=x
    80％(80％x-20)+20+68=x
    0.6+2x=1.4-3x
    9x-5=4-x
    -5/4x+6=x-12
    2x+6=9-x-（-3）
    X-1-1/2x=3-0.5x-2
    2(7+y)+3y=15
    2(7-y)+3y=15
    arctanx+arctan0.1x=π/2

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